Testing device for spark-plugs.



W. BROWN.

TESTING DEVICE FOR SPARK PLUGS. APPLICATION FILED NOV-17. 19m.

1,170,407. Patented Feb. 1, 1916.

without danger of shock to the operator.

practically nil.

UNITE STATES rairnn'r o F oE.

wILLIs nnown, 0F oGLnsBY,' ILLINQ'IS.-

rns'rme DEVICE son srAnk-PLUes.

testing devices for the spark plugs of hydrocarbon engines and has particularapplica tion to a portable testing device. 1 I

In carrying out the present nvention, 1t is my purpose to provide a device ofthe class described which may be readily. and conveniently applied to the spark plug when it is desired to determine whether or not I the current is passing through the plug,

It is also my purpose to provide a device of the class described which may be conveniently handled and stored in a small space when not in use and which will embody few parts and these so correlated and arranged as to ren'der-thepossibility of derangement,

With the above and other objects in view, the invention-consists in .the construction, combination and arrangement of parts hereinafter set forth in and falling within the scope of the claims.

In the accompanying drawing, Figure 1 is a view in front elevation of a spark plug testing device constructed in accordance with the present invention. Fig. 2 is a view in edgeelevation of the device. Fig. 3 is aw bottom plan view. Fig. I is a top planview. Fig.15 is a fragmentary vertical sectional view through the device.

Referring now to the drawing in detail, 1 designates the body of the device, which,

in the present, instance, is substantially T- shaped comprising a head 2 and. stem 3 formed of any suitable insulating material such, for instance, as fiber. The outer face of the head 2 is cut out to form a concaved recess 4 alining with the stem 3 of the body,

whilesecured to the outer surface of the 1 head 2 at opposite sides of'the recess 4: are contact plates 5, 5 respectively. These plates 5 are constructed of suitable metal capable of conducting an electric current and, in thepresent instance, the end portlons of each plate are upturned as at 6 to lie within the groove 4 and against the end .of 'the head respectively.

Specification of Letters Patent.

Patented Feb.- 1,

Application filed November 17, 1914. Serial-No. 872,597.

Formed in the stem 8 at the junction of the latter with the head 2 is a transversely disposed opening 7 and'formed in theedges of the stem at oppositesides of the opening 7 are apertures 8 communicatin with the opening at diametrically opposite points.

Formed in the head 2 at opposite sides-of the recess 4 are apertures 9 corresponding to the respective apertures 8 andv formed in the outer edge of thehead 2 are grooves 10 com- 'municating with the adjacent ends of the respective apertures-9,- the grooves 10 opening onto the inner surfaces of the respective contact plates 5. 7

Passed through the'apertures 9-are conducting wires ll'each having oneen'd thereof lying within the adjacent groove 10 and soldered or otherwise secured to the inner surface ofthe particular contact plate 5 and the opposite end passed through the adja- .cent aperture 8 in the stem 3 and extending into the opening 7 to provide a terminal 12.

These terminals 12 are spaced apart within the opening 7 and disposed diametrically opposite one another to form a spark gap across which the spark is adapted tojump when the device is in "use.

In practice, the contact plates 5, 5 are placed in contact with the spark plug to electrically connect with the respective electrodes of the plug and if current is flowing such current will pass through the plates 5 and wires 11 and jump across the gap between the terminals 12 and produce a spark in such gap which spark being visible through the opening 7, notifies the operator that the current is flowing. In the use of the device, the stem 3 constitutes a handle whereby the device may be conveniently applied to the plug.

I claim: I

1. A testing device for spark plugs coinprising a substantiallyT-shaped body having an openlng formed therein, contact.

plates on the head of said body and spaced}? apart, and conducting wires connected with said plates respectively and extendinginto said sight opening and spaced apart therein to form a spark gap.

2. A testing device pr ising a substantially T-shaped body having a recess formed inthe outer edge of the head thereof approximately centrally of such ed' e, contact plates secured to said edge of the ead at op osite sides of the recess therein, said body eing formed with a. sight for spark plugs com opening, and:- conducting wires connected with the respective plates and extending into said sight opening therein to form a spark l i V 3. A testing device for spark plugs comprising a substantially T-shaped body having a sight opening formed therein at the junction of the stem and head and having a groove formed in the outer edge'of the head thereof centrally of said head, contact plates secured to the outer edge of said head at opposite sides of the groove therein, and conducting wires connected with the respective plates and extending into said opening and spaced apart therein to form a spark gap.

Copies ofi'h i s patent may be obtained vfor five cents each, by addressingthe TVILLIS BROWN.

my signature Witnesses:

C. L. CARMAN, A. J. GALT.

Commissioner of Patents,

Washington, D. C. 

